Radial Engineering SW4
Audio Switcher, 4 Channel


The Radial SW4 is a four channel balanced audio switcher designed for wireless systems, mixing consoles and digital guitar processors to provide backup or greater operational flexibility in a live performance or concert setting.

Each of the four channels is equipped with two XLR inputs and a transformer isolated output that is capable of over +20 dB signal handling at all frequencies. This makes the SW4 equally viable for wireless mic systems as it is for switching high output mixing consoles. Channels may be linked together for stereo, tri-channel or quad switching and additional SW4s may be linked for larger system requirements and remotely controlled if need be. Channel-1 is augmented with a 'mix' function that passively sums both inputs together for simultaneous use. All channels are routed to a master bus with 1 & 3 assigned left, and 2 & 4 assigned right.

For monitoring, each channel is equipped with a 3-position PFL switch that selects between source-A, source-B or the stereo bus via the built-in headphone amplifier. The bus may be switched to mono when used with wireless guitar systems. This is augmented with two isolated 1/4" guitar outputs with a top-mounted 'set and forget' level control and a front-panel mono output to feed a monitor, tuner or guitar amp.

Radial Engineering SW4 Features:

  • Transformer: Eclipse ET-LD2 line output
  • Input pad: Variable trim control
  • Switches: AB select on each channel
  • PFL (pre-fade listen): A & B per channel, master bus
  • Bus: Master bus out with headphones
  • XLR configuration: AES standard pin-1 ground, pin-2(+), pin-3 (-)
  • Input connectors: XLR female
  • Output connectors: XLR male, 1/4" guitar
  • Bus output: Stereo or mono assignable
  • Ground lifts: On all channels & guitar amp outputs

Radial Engineering SW4 Specifications:

  • Audio circuit type: Passive Transformer Coupled with Relay Switching
  • Number of channels: 4 x AB select
  • Frequency response: 10 Hz to 40 Khz
  • Dynamic range: 136 dB
  • Total harmonic distortion: 0.002%
  • Phase deviation: < 3° at all frequencies
  • Inermodulation distortion: 0.01%
  • Input impedance: Load impedance in parallel with 10K
  • Maximum input: +26 dBu channel to channel
  • Maximum input: +17 dBu channel to bus
  • Channel to channel gain:
    • -0.26 dB with 10k Ohm load
    • -2.3 dB with 600 Ohm load
  • Channel to bus gain: + 8 dB with 10k Ohm load
  • Channel output impedance: 160 Ohms
  • Bus output impedance: 500 Ohms
  • General
    • Power: External 100V - 240V AC with 48V Phantom
    • Construction: 14 gauge steel chassis & outer shell
    • Finish: Durable powder coat
    • Size: (L x W x D): 17.5" x 6" x 1.75" (44.5 x 15.25 x 1.75cm) 
    • Shipping size: (L x W x D): 22" x 10" x 4.5" (55.9 x 25.4 x 11.4cm)
    • Conditions: For use in dry locations only between 5°C and 40°C (41°F and 104°F)
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